IB Biology HL C3.1.6 follows sensory input from receptor cells through sensory neurons to the brain. Practise explaining visual and auditory pathways and naming their key relay structures.
Explain how the eye detects stimuli and sends information to the brain.
a. photoreceptors/cones/rods detect «reflected» light/stimulus
b. cones found in fovea «of retina» and rods found all over retina
c. rods active in low-intensity/dim light
d. cones active in high-intensity/bright light
e. rods give black and white vision
f. cones detect colours
g. bipolar neurons/cells synapse with multiple rods but «only» with individual cones
h. bipolar neurons/cells «in the retina» form synapses with ganglion cells
i. electrical/nerve impulses travel to brain/occipital lobe via the optic nerve
j. right field of vision from both eyes sent to the left part of the visual cortex through the chiasma «and vice versa»
Marking guidance:
Allow answers in annotated diagrams
OWTTE
6 max